Explicitly only add transport-cc RTCP feedback param to default FlexFEC codec.

webrtc/media/engine/webrtcvideoengine2_unittest.cc

Index: webrtc/media/engine/webrtcvideoengine2_unittest.cc
diff --git a/webrtc/media/engine/webrtcvideoengine2_unittest.cc b/webrtc/media/engine/webrtcvideoengine2_unittest.cc
index 5944883e1c20d68b799e20d7dfcb59b94e7ddb77..f3816e682f6fa6c6d745d94bd02b6236017fb4f7 100644
--- a/webrtc/media/engine/webrtcvideoengine2_unittest.cc
+++ b/webrtc/media/engine/webrtcvideoengine2_unittest.cc
@@ -50,7 +50,8 @@ cricket::VideoCodec RemoveFeedbackParams(cricket::VideoCodec&& codec) {
   return codec;
 }
 
-void VerifyCodecHasDefaultFeedbackParams(const cricket::VideoCodec& codec) {
+void VerifyCodecHasDefaultMediaFeedbackParams(
+    const cricket::VideoCodec& codec) {
   EXPECT_TRUE(codec.HasFeedbackParam(cricket::FeedbackParam(
       cricket::kRtcpFbParamNack, cricket::kParamValueEmpty)));
   EXPECT_TRUE(codec.HasFeedbackParam(cricket::FeedbackParam(
@@ -1533,7 +1534,7 @@ TEST_F(WebRtcVideoChannel2Test, TransportCcCanBeEnabledAndDisabled) {
 }
 
 TEST_F(WebRtcVideoChannel2Test, NackIsEnabledByDefault) {
-  VerifyCodecHasDefaultFeedbackParams(default_codec_);
+  VerifyCodecHasDefaultMediaFeedbackParams(default_codec_);
 
   cricket::VideoSendParameters parameters;
   parameters.codecs = engine_.codecs();
@@ -2370,6 +2371,16 @@ class WebRtcVideoChannel2FlexfecTest : public WebRtcVideoChannel2Test {
 
 // TODO(brandtr): Merge into "non-field trial" test when FlexFEC is enabled
 // by default.
+TEST_F(WebRtcVideoChannel2FlexfecTest,
+       DefaultFlexfecCodecHasTransportCcFeedbackParam) {
+  EXPECT_TRUE(
+      GetEngineCodec("flexfec-03")
+          .HasFeedbackParam(cricket::FeedbackParam(
+              cricket::kRtcpFbParamTransportCc, cricket::kParamValueEmpty)));
+}
+
+// TODO(brandtr): Merge into "non-field trial" test when FlexFEC is enabled
+// by default.
 TEST_F(WebRtcVideoChannel2FlexfecTest, SetDefaultSendCodecsWithoutSsrc) {
   FakeVideoSendStream* stream = AddSendStream();
   webrtc::VideoSendStream::Config config = stream->GetConfig().Copy();